Lost in the Tunnel of Time

Ziggy, Rashawn, Jerome, and Rico -- the Black Dinosaurs -- are thrilledto discover that their hometown was a stop on the UndergroundRailroad. Even more exciting, their new friend Mr. Greene hasgiven them an old map that shows a secret passage, dating back tothe days of the Railroad, right under their own school! How canthe Black Dinosaurs resist making plans to check it out?When a trapdoor slams behind them, locking them in the tunnel,there's only one thing they can do -- plunge deeper and deeper intothe darkness. Where will the tunnel lead them? And will the old,crumbling walls hold until they find their way to the end?